Cisco Unified Communications Manager clustering creates scalability in a network. Which administrative action increases performance in a Cisco Unified Communications Manager cluster?

DSP resources are hardware modules on voice gateways and are not a process that can be enabled or configured via the CUCM administration GUI.

Using only one endpoint reduces redundancy and does nothing to improve cluster processing performance or scalability.

Providing multiple interfaces for remote administration is an access convenience feature and has no direct effect on cluster processing performance.

CUCM clustering allows individual services - such as the CallManager service, CTIManager, or database replication - to be assigned to specific subscriber nodes, reducing CPU and memory load on any single server. Distributing these processes across multiple machines allows the cluster to handle a greater number of registered devices and concurrent calls simultaneously. This service segregation is the primary architectural reason for deploying a multi-node CUCM cluster versus a standalone publisher.